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Mercury Engine Stops
#11888945
10/19/16 04:24 PM
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Joined: Dec 2008
Posts: 6,980
Fishbonz
OP
TFF Celebrity
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OP
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Joined: Dec 2008
Posts: 6,980 |
I have an older Mercury 150 hp Blk Max XR4 motor that had a previous owner.The PO had did some performance upgrades,pistons ,carburation etc, that really made this engine fly.Recently ,after a few fishing trips ,I`ve noticed that while idleing it will just STOP and wont start up immediately afterwards.!? When it does start it`s business as usual no loss of power that I can feel it gets up on plane and runs like a scalded dog.My Question is...is it time for a tune up and if so how often should I have one done?
HE aka Fishbonz
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Re: Mercury Engine Stops
[Re: Fishbonz]
#11889780
10/20/16 12:16 AM
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Joined: Dec 2008
Posts: 6,980
Fishbonz
OP
TFF Celebrity
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OP
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48 views and not one response? Cmon guys does`nt anyone have a clue?
HE aka Fishbonz
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Re: Mercury Engine Stops
[Re: Fishbonz]
#11889881
10/20/16 01:05 AM
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Joined: Dec 2013
Posts: 349
Capt Jerry
Angler
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Angler
Joined: Dec 2013
Posts: 349 |
Carb Merc motors do not like being tilted up prior to restarting. Try pumping the primer bulb after lowering the motor. Also, plan to change the bulb and fuel line every few years as they are prone to breakdown caused by the crappy ethanol fuel we are forced to buy.
An annual tune-up by a skilled mechanic is advised. Not sure who in your area is qualified, but you can find good mechanics via this site.
I have an older carb motor and it runs great, but it is definitely harder to start than a fuel-injected motor.
________________________________________
I fish because the voices in my head tell me to.
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Re: Mercury Engine Stops
[Re: Fishbonz]
#11889940
10/20/16 01:40 AM
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Joined: Nov 2002
Posts: 4,439
Gamblinman
TFF Team Angler
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TFF Team Angler
Joined: Nov 2002
Posts: 4,439 |
Make sure you have the motor trimmed up to keep the exhaust ports above the waterline when idling.
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Re: Mercury Engine Stops
[Re: Fishbonz]
#11889995
10/20/16 02:03 AM
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Joined: Nov 2006
Posts: 2,846
TLW
Extreme Angler
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Extreme Angler
Joined: Nov 2006
Posts: 2,846 |
had one doin' that several years ago... no pattern, jus ever so often... never failed ta restart and run a hole in tha wind.. always got 'em back to tha ramp... never found tha cause!!!
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Re: Mercury Engine Stops
[Re: Fishbonz]
#11890277
10/20/16 12:19 PM
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Joined: May 2003
Posts: 11,586
gary purdy
TFF Guru
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TFF Guru
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Posts: 11,586 |
Power valves need serviced or replaced. They are one way valves in the bleed system to prevent puddling, that will cause the motor to load up, associated with early Merc carb motors.
The world will not be destroyed by those who do evil, but by those who watch them without doing anything. Remember what He has done and remember that He is not done yet!-- GOD IS GOOD
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Re: Mercury Engine Stops
[Re: Fishbonz]
#11891722
10/21/16 01:45 AM
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Joined: Jun 2004
Posts: 1,509
OPTI
Extreme Angler
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Extreme Angler
Joined: Jun 2004
Posts: 1,509 |
Like Gary said check the bleed circuit check valves they could be stopped up or more likely wide open Does it smoke and chug before it dies. If the check valves are bad the fuel will just sit there in intake and drown the motor in fuel......OPTI
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Re: Mercury Engine Stops
[Re: Fishbonz]
#11893990
10/22/16 03:41 PM
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Joined: Jul 2005
Posts: 1,887
lakeman
Extreme Angler
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Extreme Angler
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Posts: 1,887 |
Not to hijack Fishbonz thread, But can the check valves in the fuel pump be cleaned and reused or is it best to buy whole new fuel pump kit ?, Reason i ask is i have a 19885 v6 175hp that i've had manyyear and this past year it started dieing on mejust like the op here said his were, I've replaced the fuel pump Diaphgragm twice in the past 15 years, Engine ser.# is OA149036, thanks for any help.
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Re: Mercury Engine Stops
[Re: Fishbonz]
#11895207
10/23/16 01:31 PM
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Joined: May 2003
Posts: 11,586
gary purdy
TFF Guru
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TFF Guru
Joined: May 2003
Posts: 11,586 |
lakeman new check valves come in the diaphragm kits. Yours being a 1985 would make me want to install carb kits w/new floats.
The world will not be destroyed by those who do evil, but by those who watch them without doing anything. Remember what He has done and remember that He is not done yet!-- GOD IS GOOD
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Re: Mercury Engine Stops
[Re: Fishbonz]
#11895231
10/23/16 01:44 PM
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Joined: Feb 2006
Posts: 3,742
bronco71
TFF Team Angler
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TFF Team Angler
Joined: Feb 2006
Posts: 3,742 |
There is a diaphragm/gasket only kit and a complete kit with diaphragm, gaskets and check valves, fuel pump check valves are not available separately.
Bleed circuit check valves are available separately....
1987 Nitro MX185/Mercury Black Max 150 1999 Triton TX21/225 Mercury Optimax
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Re: Mercury Engine Stops
[Re: bronco71]
#11895768
10/23/16 08:58 PM
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Joined: Dec 2008
Posts: 6,980
Fishbonz
OP
TFF Celebrity
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OP
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Posts: 6,980 |
There is a diaphragm/gasket only kit and a complete kit with diaphragm, gaskets and check valves, fuel pump check valves are not available separately.
Bleed circuit check valves are available separately.... Is this kit recommended for the XR4 150 Merc??
HE aka Fishbonz
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Re: Mercury Engine Stops
[Re: Fishbonz]
#11896431
10/24/16 05:12 AM
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Joined: Feb 2006
Posts: 3,742
bronco71
TFF Team Angler
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TFF Team Angler
Joined: Feb 2006
Posts: 3,742 |
I believe there were 2 different pumps used on that one, a square pump and a sort of rectangular one, I have the rectangular one and looked for the fuel pump check valves for a bit as I already had the diaphragm/gasket only kit. After no luck locating the kit with the valves locally and finding out they were not available separately I talked to mechanics and parts dept. at a couple service centers I was told they were not stocked cuz they never go bad and to reuse them and change the diaphragm and gaskets.....if still having problems check/change the bleed circuit check valves...
I rebuilt the pump yesterday reusing the check valves as I did years ago but haven't lake tested it yet. Pretty sure my bleed circuit check valves are original as they have black paint on them, sure wish I would have thought about them when I had the carbs off.....
1987 Nitro MX185/Mercury Black Max 150 1999 Triton TX21/225 Mercury Optimax
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Re: Mercury Engine Stops
[Re: bronco71]
#11896776
10/24/16 02:59 PM
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Joined: Dec 2008
Posts: 6,980
Fishbonz
OP
TFF Celebrity
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OP
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I believe there were 2 different pumps used on that one, a square pump and a sort of rectangular one, I have the rectangular one and looked for the fuel pump check valves for a bit as I already had the diaphragm/gasket only kit. After no luck locating the kit with the valves locally and finding out they were not available separately I talked to mechanics and parts dept. at a couple service centers I was told they were not stocked cuz they never go bad and to reuse them and change the diaphragm and gaskets.....if still having problems check/change the bleed circuit check valves...
I rebuilt the pump yesterday reusing the check valves as I did years ago but haven't lake tested it yet. Pretty sure my bleed circuit check valves are original as they have black paint on them, sure wish I would have thought about them when I had the carbs off..... Thank you for your response bronco71 What year and motor type do you have?
Last edited by Fishbonz; 10/24/16 03:03 PM.
HE aka Fishbonz
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Re: Mercury Engine Stops
[Re: Fishbonz]
#11896876
10/24/16 03:44 PM
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Joined: Feb 2006
Posts: 3,742
bronco71
TFF Team Angler
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TFF Team Angler
Joined: Feb 2006
Posts: 3,742 |
I believe there were 2 different pumps used on that one, a square pump and a sort of rectangular one, I have the rectangular one and looked for the fuel pump check valves for a bit as I already had the diaphragm/gasket only kit. After no luck locating the kit with the valves locally and finding out they were not available separately I talked to mechanics and parts dept. at a couple service centers I was told they were not stocked cuz they never go bad and to reuse them and change the diaphragm and gaskets.....if still having problems check/change the bleed circuit check valves...
I rebuilt the pump yesterday reusing the check valves as I did years ago but haven't lake tested it yet. Pretty sure my bleed circuit check valves are original as they have black paint on them, sure wish I would have thought about them when I had the carbs off..... Thank you for your response bronco71 What year and motor type do you have? mine is the older 1980 Mercury 150 Black Max
1987 Nitro MX185/Mercury Black Max 150 1999 Triton TX21/225 Mercury Optimax
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Re: Mercury Engine Stops
[Re: Fishbonz]
#11897001
10/24/16 05:11 PM
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Joined: Dec 2008
Posts: 6,980
Fishbonz
OP
TFF Celebrity
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OP
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Thanks again sir ! Let me know how your lake test turns out. That could just possibly be what my engine issue is.How much is the diaphragm/gasket only kit and where can I purchase one?
HE aka Fishbonz
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